Overnight boiled water can drink, overnight raw water, tea do not drink. Boiled water is generally placed in a thermos, thermos storage, because the water has been boiled, the bacteria and other pathogenic microorganisms have been killed, so placed in a clean thermos stored overnight, the next day to drink relatively safe. But be sure to note that after opening the bottle cap overnight mineral water, the next day do not continue to drink, if you want to drink the best boil after drinking. Because raw water at room temperature, without taking strict anti-bacterial measures, easy to have bacterial growth, long-term intake of such water is not conducive to good health. In addition, do not drink overnight tea, tea contains tea polyphenols, tea polyphenols in the air and water are easily oxidized into tea scale. Overnight tea is exposed to the air for a long time, so the amount of tea scale contained in it is relatively large, making the nutritional value of tea decline, but also the risk of bacterial flora overload.